How Strongly Does a Magnet Hold onto Steel?
A magnet's holding force on an iron or steel surface depends on several factors:
Magnet type and strength: For comparable dimensions and suitable magnetic circuits, neodymium magnets generally provide greater holding force than ceramic ferrite magnets.
Condition of the steel surface: A magnet holds better on a smooth, clean surface than on a rough or rusty one.
Distance between magnet and surface: Even a small air gap can significantly reduce holding force.
Dimensions of the magnet and steel: Contact area and the thickness and shape of the steel all affect the magnetic circuit and the resulting holding force.
Magnet temperature: Temperature can also affect holding force, as excessive heat may reduce magnetisation.
Suitably designed neodymium magnetic assemblies can provide holding forces equivalent to the weight of hundreds of kilograms under specified test conditions. Actual performance depends on the complete assembly and contact conditions; material type alone does not determine the load a magnet can hold.
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